Re: LTO Question
Re: LTO Question
- Subject: Re: LTO Question
- From: Luca Ciciriello <email@hidden>
- Date: Fri, 08 Mar 2013 20:05:32 +0100
I'm using Xcode 4.6 on OS X 10.8.2.
The "anomaly" I've described is present both on the simulator and on device.
Another thing. If LTO is enabled no breakpoint is reached.
Which kind of information do you need?
Luca.
On Mar 8, 2013, at 6:18 PM, Sean McBride <email@hidden> wrote:
> On Fri, 8 Mar 2013 13:49:57 +0100, Luca Ciciriello said:
>
>> There is some aspect of the Link-Time Optimization that I do not
>> understand very well.
>>
>> I've an iOS application with a massive use of C++11, in particular
>> "regex" and "for_each with lambda functions". Some routines of this
>> application are very time consuming. In example I've a routine that
>> needs 3268 milliseconds to perform its task. As I told you before this
>> routine is written in C++11 (I use -std=c++11 in Xcode settings)
>> Now Activating the LTO from Build Settings in Xcode I see that this time
>> increase to 4002 milliseconds. This is contrary to my expectation of
>> optimisation and do not understand why.
>
> You don't really give enough info for anyone to help.
>
> Have you run Instruments.app to profile your code?
>
> Cheers,
>
> --
> ____________________________________________________________
> Sean McBride, B. Eng email@hidden
> Rogue Research www.rogue-research.com
> Mac Software Developer Montréal, Québec, Canada
>
>
>
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